John henry abel



, (No Model.)

J. H. ABEL. PNEUMATIC DOOR CLOSER, CHECK, AND ALARM. Nu l 19,891. Patented Apr. 7, 1891.

NITED STATES PATENT OFFICE.

JOHN HENRY ABEL, OF LONDON, ENGLAND.

PNEUMAT IC DOOR CLOSER, CHECK, AND ALARM.

SPECIFICATION forming part of Letters Patent No. 449,891, dated April '7, 1891. Application filed August 5 1890. Serial No- 361,142. (No model.) Patented in England $eptember 14, 1888, No. 13,309-

.To all whom it may concern:

Be it known that I, JOHN HENRY ABEL, a subject of the Queen of Great Britain, and a resident of London, in the county of Essex, England, have invented certain new and usefullmprovements in Pneumatic Door Closers, Checks, and Alarms, of which the following is a specification.

My invention relates especially to devices employed in connection with doors and the frames thereof to close the door quietly, preventing slamming, and also give notice by means of an alarm when the door is being opened; and the object of my invention is the provision of a cheap, simple, and efiective door closer and check, and an acoustic alarm connected therewith, all of which will be hereinafter first fully described, and then pointed out in the claims.

To attain the desired end, my inventionand wherein is inclosed a V-shaped spring,

and in the combination, with said bellowsframe, of suitable arms and levers for connecting the same with a door and frame, and a whistle-alarm mounted upon or connected with the air-chamber.

In the drawings, Figure l is a side elevation of the air-chamber or bellows. Fig. 2 is a horizontal sectional view at liners x of Fig. 1. Fig. 3 is an end elevation of the device, showing the arrangement of the levers and hinge connection. Fig. 4 is a plan view of the device as in use, the position occupied by the air-chamber and levers when the door is opened being indicated by the dotted lines. Fig. 5 is a side elevation of that portion of the air-chamber having the egress-valve,

showing the arrangement of the alarm. Fig. 6 is a sectional view at line y y of Fig. 5 and through the alarm.

Like letters of reference, wherever they occur, indicate corresponding parts in all the figures.

A A are the rigid walls of the air-chamber or bellows hinged together at Ct.

B is a fiat V-shaped spring secured near the outer extremities of walls A within the air-chamber, as particularly illustrated in Fig. 2.

O is the flexible wall of the air-chamber arranged in bellows form.

D is a perforation through the rigid wall A, and cl is a strip of flexible material secured thereover and forming an egress-valve. E is a second smaller perforation, and e is a stop or shutter pivoted thereover, so as to be turned to one side or over the perforation, as desired.

L is a valve openinginto the interior of the air-chamber.

F is a slotted plate secured to the Wall A, and G is apin which passes through said slot and engages with the door-frame.

h h are arms fixed at each side of the outer portion of the wall A, and H H are levers pivoted thereto and to a bearing It upon the door.

I is a hinge fixed to the outer extremity of wall A upon the side opposite to the arms h, and arranged to be secured to the door N.

J is a whistle secured to a plate M, which is made hollow beneath to accommodate the valve d, and is secured thereover. At one side of the whistle a perforation m in the plate M is provided to allow the air to escape from the air-chamber without sounding the whistle, when desirechand' over the perforation is a movable regulating-plate K. I have shown the whistle as attached directly to the wall of the air-chamber; but it is obvious that a pipe or tube might be connected to the airchamber and carried to any convenient point and provided with an acoustic alarm at its extremity without departing from the spirit of my invention.

When constructed and arranged in accordance with the foregoing description, the operation of my device is as follows: The parts being secured in place, the bellows being connected with the door and fiXed'to the frame, or connected with the frame and fixed to the door, the door is held closed through the medium of the spring. If the door he opened, the spring will be compressed and the bellows closed, and the air as it is forced from the chamber will sound the alarm. As the door opens its'outer edge describes a circle or path, as'indicated, by the arrow in Fig. 4, and by reason of the arms H, connected to the inner extremity of the bellows and to the door, the

bellows describes a portion of a circle of smaller radius than the door, and also moves longitudinally, being guided in such movement by the pin G, which extends into the slot in plate F. The result of these motions is that the bellows is shut and the inclosed spring compressed. When the door is released, it closes through the medium of the spring, the air is slowly admitted to the airchamber, the movement of the door being first rapid; but such movement is checked by the partial vacuum formed in the air-chamber by the expansion of the bellows, the final closing of the doorbeing noiseless and slow. The admission of air to the bellows is regulated to suit the requirements by means of the slide e.

alarm,in which iscomprised abellows or airchamber containing a V-shaped spring, connections between the bellows-frame and a door and door-frame, and an acoustic alarm having an air-passage connecting with the air-chamber, substantially as shown and described.

2. In a door closer and check, a bellows or air-chamberprovided with valves, as set forth, andaV-shapedspringadaptedand arranged to close the door, the checking of the action of the spring being accomplished by a partial vacuum within the air-chamber, substantially as shown and described.

In testimony that I claim the foregoing I have hereunto set my hand this 5th day of December, 1888.

JOHN HENRY ABEL.

Witnesses:

EMRA O. EATON, J NO. BRIDGES. 

